"Harmony between man and nature" is a consistent proposition about the relationship between man and nature in China ancient culture. Laozi and Zhuangzi repeatedly emphasized the thought of "Tao and nature" and "inaction", that is, they emphasized the harmonious coexistence between man and nature, that is, "the unity of man and nature". The ancients also knew to make rational use of natural resources. Mencius said in "I am in the country": "If you don't go against the farming season, you can't beat grain; If you don't count, neither fish nor turtle can be eaten. Axe gold gets into the mountain in time, and mywood can't be used. Valley and fish turtles can't fight for food, and wood and wood can't fight for it, which makes people lose their lives and have no regrets. There is no regret in being born and dying, and the beginning of the king is also. " It embodies the concern and protection consciousness for the living environment. Zhuangzi said, "Animals can swim in prison, birds can climb and peek", which painted us a romantic picture of harmony between man and nature. Lu's Spring and Autumn Annals advocates making good use of and protecting natural resources, opposes "fishing with exhausted resources", and requires a kind and friendly attitude towards all things in nature, and treats birds, animals and plants well. These rich ideas of protecting natural resources are increasingly showing their practical significance in today's deteriorating natural environment.